On his twitter account, President Felipe Calderón says Mexico's seismology agency says the earthquake measured 7.8 on the Richter scale. He adds, "There are still no reports of major damage."

Update at 2:50 p.m. ET. No Major Damage In Mexico City:

The mayor of Mexico City, Marcelo Ebrard, is reporting no major damage in his city. On his twitter account, Ebrard says they've inspected the central part of the city, the northern part of the city and there are no mayor damages.

The airport, Ebrard reports, is also operating normally.

Update at 2:43 p.m. ET. Felt Strongly In Acapulco:

CNN Español reports that the earthquake was felt strongly in Acapulco, too. It forced residents to the streets.

CNN also reports that slowly office workers in Mexico City are returning to their office towers.

Update at 2:38 p.m. ET. No Major Damages Reported Yet:

Mexican President Felipe Calderón just tweeted that "no major damages have been reported, according to a national seismologist."

Update at 2:32 p.m. ET. Mexico City Feels Strong Shaking:

Olivia Sanchez, a Mexico City resident, just told our Newscast unit that the earthquake shook the city very hard. She said that people are on the streets right now and the lights went off momentarily.

She said the phones have stopped working and she can hear helicopters in the air.